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Poly-Fast 72-40 Liquid Mold Rubber

Poly-Fast 72-40 is a dense, medium hardness rubber used primarily for sculptural applications and investment casting with wax.

This room-temperature curing polyurethane mold rubber can be poured as supplied or thickened with liquid Poly-Fast 72 Part D, Fumed Silica or PolyFiber II. It can be softened with Poly-Fast 72 Part C to make rubbers softer than a Shore A10.

NOTE: Cured molds may degrade with age and should not be considered for molds where long shelf life is required. For rubber options that will not soften with age, consider Poly 74-Series polyurethane mold rubbers.